<p>The protest is being led by several prominent opposition figures, including Boris Nemtsov, who was arrested and jailed for 15 days following a similar demonstration a month ago.<br /><br />Nemtsov's arrest drew Western condemnation and mobilized his supporters, who held daily pickets outside the jail where he was being kept.<br /><br />The demonstrations are held on the last day of every month with 31 days to call attention to the 31st Article of Russia's Constitution, which guarantees freedom of assembly.<br /><br />The city authorized toay's rally, but it also authorized the rally Dec. 31, during which 68 people were detained.<br />Hundreds of police surrounded the square.</p>
<p>The protest is being led by several prominent opposition figures, including Boris Nemtsov, who was arrested and jailed for 15 days following a similar demonstration a month ago.<br /><br />Nemtsov's arrest drew Western condemnation and mobilized his supporters, who held daily pickets outside the jail where he was being kept.<br /><br />The demonstrations are held on the last day of every month with 31 days to call attention to the 31st Article of Russia's Constitution, which guarantees freedom of assembly.<br /><br />The city authorized toay's rally, but it also authorized the rally Dec. 31, during which 68 people were detained.<br />Hundreds of police surrounded the square.</p>